Rb25 chassis and diff change question

[240s-sex]

Hey guys in the middle of prepping my s14 for my old Rb out of the coupe, I have the subframe out for new subframe and control arm bushings and grease fittings(whole build thread coming soon) and I noticed this chassis has a j30 diff.

My coupe had a na 300 diff with the 4.08 and now I have the 3.9x and I'm wondering how much of a difference in this would make in accel, highway rpms and all that, cause I really enjoyed how the coupe drove...esp the 40mpg highway lol

Is it gonna be a noticeable difference or just mild?

Thanks in advance

[robbie2883]

you'regoing to have a little longer gearing. not a HUGE different. it's not like going to the TT 3.59 but they will be a little longer.